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Haring, Keith

(Encyclopedia)Haring, Keith hârˈĭng [key], 1958–90, American artist, b. Kutztown, Pa. He moved to New York City in 1975 and studied at the School of Visual Arts (1978–79). Fascinated with the 1970s graffiti ...

function

(Encyclopedia)function, in mathematics, a relation f that assigns to each member x of some set X a corresponding member y of some set Y; y is said to be a function of x, usually denoted f(x) (read “f of x ”)....

narcolepsy

(Encyclopedia)narcolepsy, a sleep disorder characterized by excessive daytime sleepiness and recurring unwanted episodes of sleep (“sleep attacks”). People with narcolepsy may abruptly fall asleep at almost any...

narthex

(Encyclopedia)narthex närˈthĕks [key], entrance feature peculiar to early Christian and Byzantine churches, although also found in some Romanesque churches, especially in France and Italy. Usually extending acro...

New York Times Company v. Sullivan

(Encyclopedia)New York Times Company v. Sullivan, case decided in 1964 by the U.S. Supreme Court. In 1960, the Times ran a fundraising advertisement signed by civil-rights leaders that criticized, among other thing...

beta particle

(Encyclopedia)beta particle, one of the three types of radiation resulting from natural radioactivity. Beta radiation (or beta rays) was identified and named by E. Rutherford, who found that it consists of high-spe...

Spratly Islands

(Encyclopedia)Spratly Islands, group of about 100 low islands and coral reefs in the central South China Sea, intersecting busy shipping lanes. The whole group is claimed by China, Taiwan, and Vietnam, and parts ar...

Sotomayor, Sonia

(Encyclopedia)Sotomayor, Sonia sōtōmīyôrˈ [key], 1954–, associate justice of the U.S. Supreme Court (2009–), b. Bronx, N.Y., to Puerto Rican parents, grad. Princeton (B.A. 1976), Yale (J.D. 1979). She work...

scarlet fever

(Encyclopedia)scarlet fever or scarlatina, an acute, communicable infection, caused by group A hemolytic streptococcal bacteria (see streptococcus) that produce an erythrogenic toxin. The disease is now uncommon, p...

silicone

(Encyclopedia)silicone, polymer in which atoms of silicon and oxygen alternate in a chain; various organic radicals, such as the methyl group, CH3, are bound to the silicon atoms. Silicones, which are unusually sta...